chore(toh): fix CI errors

Author: filipesilva

public/docs/_examples/toh-4/ts/app/hero.service.1.ts

@@ -4,6 +4,7 @@
 import { Injectable } from '@angular/core';
 
 // #enddocregion empty-class
+import { Hero } from './hero';
 import { HEROES } from './mock-heroes';
 
 // #docregion empty-class, getHeroes-stub

public/docs/_examples/toh-6/ts/app/hero-search.component.ts

@@ -55,4 +55,4 @@ export class HeroSearchComponent implements OnInit {
     let link = ['/detail', hero.id];
     this.router.navigate(link);
   }
-}
+}